From fcf81db600385be24baae2dd1c1994150e409a7b Mon Sep 17 00:00:00 2001 From: Dan Gohman Date: Mon, 25 Feb 2008 21:57:04 +0000 Subject: [PATCH] Remove the hack that turned an {S,U}MUL_LOHI with an unused high result into a MUL late in the X86 codegen process. ISD::MUL is once again Legal on X86, so this is no longer needed. And, the hack was suboptimal; see PR1874 for details. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47567 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Target/X86/X86ISelDAGToDAG.cpp | 9 --------- 1 file changed, 9 deletions(-) diff --git a/lib/Target/X86/X86ISelDAGToDAG.cpp b/lib/Target/X86/X86ISelDAGToDAG.cpp index c8b341406ca..75e9faecb29 100644 --- a/lib/Target/X86/X86ISelDAGToDAG.cpp +++ b/lib/Target/X86/X86ISelDAGToDAG.cpp @@ -1224,15 +1224,6 @@ SDNode *X86DAGToDAGISel::Select(SDOperand N) { SDOperand N0 = Node->getOperand(0); SDOperand N1 = Node->getOperand(1); - // There are several forms of IMUL that just return the low part and - // don't have fixed-register operands. If we don't need the high part, - // use these instead. They can be selected with the generated ISel code. - if (NVT != MVT::i8 && - N.getValue(1).use_empty()) { - N = CurDAG->getNode(ISD::MUL, NVT, N0, N1); - break; - } - bool isSigned = Opcode == ISD::SMUL_LOHI; if (!isSigned) switch (NVT) {